what would it cost per household for council to harvest rainwater and to sewer mine and to provide a reticulated system of rescued water for toilet flushing and garden watering? Currently grey water diverting and treatment (if you want to store it for more than 24 hours) would cost around $10,000 per household - not a very attractive proposition. Individual pumps would be less economical in initial purchase and in running costs (on green power of course) than neighbourhood or municipality wide methods of providing sufficient pressure.
Private gardens represent a valuable resource for the community: they sequester carbon, they provide a creative outlet for gardeners, they provide visual delight for all who see them, a harbour for birds, and a cultural resource.. can we afford not to have a community based water source to maintain them?
Well here it is: CSIRO is working on the integrated management of urban water http://www.csiro.au/science/ps3k3.html bring it on!